P1406 - DPF EGR Sensor Downstream Hose Off Or Plugged

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

P1406 - DPF EGR SENSOR DOWNSTREAM HOSE OFF OR PLUGGED

Description:	While driving, the EGR monitor commands the EGR valve closed and checks the differential pressure across the EGR orifice. The test fails when the signal from the DPF EGR sensor continues to indicate EGR flow even after the EGR valve is commanded closed.
Possible Causes:	Downstream hose is disconnected. Downstream hose is plugged (ice). Plugged or damaged EGR tube.
Diagnostic Aids:	Look for signs of water or icing in the hose. Verify the connection and routing (no excessive dips). Verify the DPF EGR sensor proper mounting and function. View the DPFEGR PID while applying and releasing vacuum directly to the sensor with a hand pump.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Vehicles with an EGR System Module (ESM)	GO to HH: Exhaust Gas Recirculation System Module (ESM) STEP 31	GO to HH: Exhaust Gas Recirculation System Module (ESM) STEP 31	GO to HH: Exhaust Gas Recirculation System Module (ESM) STEP 31
All Others	GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP 31	GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP 31	GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP 31